Just thought you guys might like to know about this.. I have just done a bit of blue-peter'ing , All you need is 8 black sacks and some parcel tape. With shorter plants you might get away with just putting 4 bin bags inside each other (or more, depends on thickness of each sack, 4 of mine was complete blackout) Then joining all the edges together and squeezing air out from between each sack. For my lanky monsters though I wanted a taller/longer cover so I used an extra 4 sacks, cut the bottom bit off to make a tube and just extended each sack to twice the length before putting them inside each other. Popped it over me and ta-daaaaaa no light AT ALL. I will start tonight putting this over mine and see what happens - probably nothing

Just becareful that they do not sweat not so bad in veg,but no good in flower

Thanks, I did think about that actually.. Have bought myself a patio heater cover today - £1.98 bargain, its made from a thick black fabric like black out fabric.. excellent and it zips up so its far easier to put on and off
Nat x

Put some canes around the inside of the pot splaying outwards, making a sort of cage so the plastic liners are not in contact with the plant when covered up, otherwise it will most certainly get a fungal problem if the humidity is to high inside the cover and its in contact with the plant.

Good luck,
GG